Sewershed 26W-005 · NYC DEP Combined Sewer Overflow Tributary Area
26W-005 - Cypress Hills, Brooklyn
Properties in this area share the 26W-005 combined sewer — during moderate-to-heavy rain, runoff can exceed pipe capacity faster than it drains, which is what drives sewer backup exposure block by block. Here’s what that looks like for Cypress Hills, Brooklyn specifically.
26W-005 is a combined sewer area covering 28,145 properties in Cypress Hills, Brooklyn. Flood Form rates 50% of them Moderate or High for stormwater exposure, and 17% for groundwater. 81% of lots have yard area that legally qualifies for on-site infiltration. Ground elevation is typically 31 ft. The median building dates to 1920. 13% of parcels sit over a historic stream or pond. According to NYC DEP green infrastructure records, this sewershed drains to Jamaica Bay and Tributaries. NYC DEP has built 1,304 green infrastructure assets here.
28,145
Properties in sewershed
81.3%
Legally eligible for on-site infiltration
50%
Stormwater exposure: Moderate or High
17%
Groundwater exposure: Moderate or High
What sets 26W-005 apart
31 ft
Median ground elevation
85%
Average impervious cover per lot
1920
Median year built
13%
Properties over a historic stream or pond
Stats computed from Flood Form’s NYC parcel data as of October 9, 2026
Common solutions for Cypress Hills properties
Downspout Diversion
Redirects roof runoff away from the combined sewer and into landscaped or permeable areas on the lot.
Infiltration System
Drywells or infiltration chambers that let stormwater soak into the ground on-site instead of entering the sewer.
Detention System
Holds stormwater temporarily and releases it slowly, reducing peak flow into the combined sewer during a storm.
Drain Improvement
Upgrades yard, area, or foundation drains so water is carried away from the building instead of pooling.
Foundation Waterproofing
Protects the foundation from groundwater intrusion, relevant where groundwater exposure runs high.
Nearby sewersheds
- 26W-004New Lots4,058 properties · 45% with Moderate or High stormwater exposure
- JAM-003South Ozone Park21,926 properties · 49% with Moderate or High stormwater exposure
- NCB-083Ridgewood13,342 properties · 38% with Moderate or High stormwater exposure
- 26W-003Brownsville12,515 properties · 41% with Moderate or High stormwater exposure
- JAM-003aSouth Ozone Park2,900 properties · 42% with Moderate or High stormwater exposure
- JAM-006South Richmond Hill327 properties · 50% with Moderate or High stormwater exposure
Want to see where your specific property stands?
Get Your Property’s Flood Form